Control for dough mixers



Sept 14, 1954 L. G. VOGEL CONTROL FOR OOUOH MIXERS Filed Oct. 50, 1950LINE LOAD

LINE

TIMER SLAVE 0R FRICTION POINTER WATT METER LINE LINE

POLYPHAS E n vVENToIL Z2@ V BY MMM/wwm Patented Sept. 14, 1954 mmf lieoGr'. Vogel, Evanston, Ill., assignor'to The W. E. f I l Long-0o.,Chicago, Ill., a corporation of Illinois! v l 1- :Aopiiootio'oootoberso, 195o, serial No. 192,949 i o ,s f 9 Claims. (014318-474) i l `Inmaking bread, 'the inter-action'of iiour and waterproducesfa 'substanclknown as gluten, the proper development'of determines thequallybfthe'br'ead. "H,

In mechanically equipped'bakeries, bread dough is mixed in' almec'hanicalmixer driven by an electric motor.' A charge io'f'flour 'andother ingredients is' 1'put into th'emfixer' and the motor is startedand drives stirre'r'sthrough the* ingredients until the dough isproperlyworkedup and the" gluten hasbeen developed 'tothe correctstag'e, atwhich tifnih' mixit ,Seem be'iioreedndpihe dough removed.

Ifitno doughl isftr'eatu 'further in the 'Inner beyond "certain shortcriticalli'mits, the bread is never asgood as'if' them'ix'er had stoppedat the right point of development in lthegluten.` [This is us' ually''determined` by an `operator, andthe human eler'n'e'nt, enters in 'andsupplies many errors and failil'res.' Effortsfto provide instruments to'tell exactly and accurately'thecondition ofthe' doughiwith respect to`the 'development of "the gluten have been going on for a, long time,but none' has been cornxriercia'lly successful. j "It has been observedthat the `power' required to drive the mixer decreases with thedeyelopinent of the gluten, and this fact is seized' urio'n toprovideau'tomatic means for stoppingthe mixer mo'- tor at thecorrect'istagelof development `of the gluten.

'The decrease in power required vprecedes the proper development of thegluten by a measurable period, andtiming devices should be usedi'to co`nv tinue" the operation of the mixer during lthat Dee' rid.

"The principal object of this invention is to provide a device ormachine to be attached-toav inechanical mixer and automatically stop themeter;

within a selectedpe'ri'd o'f time' after the drop o'f power 'consumptionappears and continues 'for .a

period lindicating proper" development 'of the'V gluten. Generallyspeaking, this is accomplished by connecting Aa'load measuring devicethrough a timer to a switch controlling the circuit o f the motor uInthe drawings: 'f f Fig; 1 is a diagram of a load'ineasuring'device, v

such as a Watt meter, connected throughr a reset timer to a switch inthe circuit of the mixer motorrone Fig. 2 isa similartdiagram in which,instead of having the indicator 'of the load measuring device actdirectly on the timer, it acts through ang intermediate ypower device,such' as a servnie" msm. y wf j .I

'f l, l indicates a motor of a mixer; I tifs cnnect'e'dacr'o-ss a lineIl, IfIin a circuit -con: trolld'by a normally closed back contact relayI2 with a"coil I3, which is controlled by a timer AIQ connected acrossthe 4line by a" circuit I5 including anrmally open back contact relay I6,` the coil I o f which is in a circuit across the line and contrlled'by thefindicating pointer Nici"aloadj measuring device' I9 and a slaveor frictionpointer 2i), which is moved in one direction bythe indicatingpointer AI8 but' must be manually moved in the opposite'di'rection.

The pointers areequippedA with vcontacts 2I and 2 2 for closing oropening the circuit, inclu'cli'ng th' soleno'idcoill'l. Y

4'When the motor jI`f0 -isA started, the indicating pointer "I 8 swingsclockwise orto the-right in Fig] on the' timer switch open.y

*When the loaddrops," the indicating pointer I8' recedesin acounterclockwise d'irectio'n, or the left in lig'; 1, opening" thecircuit between thec'on- 20` starting the timer."

1r the contacts 2| 'and 22 remainsooorateof for a period selected insettingthe timerfor'inswitch I2 inf the' circuit of the'motorlll,

"If, however, the load changes' 'onthe increase and thecon'tact 2 I`Vcloses again withthecontact 2'2` before' th'tWO- nil'i'llt limit iSset," thesl'nod coilI'l will operithe switch I6 a-'Iidr'ese't the'timeri4 for another operation; This' will continue `as the indicating'pointerv "I8 `vacillats until the Aconoor'rosponumg tothe setting ofthetimer l L -'when the motor II) will beistopped" l Ordinarily, "thetorque of 'the load' measuring device,"such 'as' a` `watt`"`meter, istoo 'feeble to movethe slave or' friction 'pointerllLwandQ if made'strong enough for 'thatpurpose,l the measur. ing' system might b e toolcostly for practical p urf" poses. Hence', some sort o` f'p'ower"devicei`s in# troduced" betweenthe indicating `pointer of theload 4rneasuring device and the f slave or yfriction pointer to movetho" latter in unsorf 'with the movement' of the indicating'pointer'."This` ar-4 rangement is illustrated 2 ,whe're thewatt meter `o'r 'the`like generally indicated by 25,15

connectedwith a load' motor y265 bya circuit 'ing' cludinga normallyclosed `solenoidlswitchjl, the

coil V28 of whichis connected with' a' ti mer 29 by aV circuit 36including af, solenoid ,switch .3| havinga Acoil 32 Ain a 'circuit`controlled by. a

,I servomechanism, generally indicated by,. 33, for

operating an indicating pointer 3 4 and ,dragging with it@ slaveorfrciionipeiilier. 3.5.- Tneoperation is 'much the same as described inconnection 'with'Fi'g 1. Starting the motor -26 puts a load on'ftheline, andthe 'indicating pointer 34 moves'to' the"right in l'Fig."2,''picking

